Blind rivet bolt

Abstract

A bolt ( 1 ) includes a screw ( 3 ) and an insert ( 2 ) which can be inserted in the opening ( 19 ) of a wall ( 5 ). The insert ( 2 ) includes an insert head ( 6 ) and a shaft ( 7 ) including a recess ( 8 ), the insert head ( 6 ) and the recess ( 8 ) being configured such as to, after deforming the recess ( 8 ), crimp the insert ( 7 ) on the wall ( 5 ). The screw ( 3 ) includes a break ring ( 14 ) designed for engaging with the insert head ( 6 ), directly or indirectly, with a view to deforming the recess ( 8 ) by rotating the screw and thus to obtain the crimping, and designed such that, once crimping is complete, the ring breaks and releases the screw ( 3 ) from the insert head ( 6 ), thus making it possible to clamp an accessory ( 4 ) to the wall ( 5 ). The invention also includes an assembly method using a bolt ( 1 ) according to the invention.

The invention claimed is: 
     
       1. Bolt ( 1 ) comprising a screw ( 3 ) and an insert ( 2 ) which can be inserted in the opening in a wall ( 5 ), said insert ( 2 ) comprising an insert head ( 6 ) and a shaft ( 7 ) comprising a recess ( 8 ), said insert head ( 6 ) and said recess ( 8 ) being configured such as, after deformation of the recess ( 8 ), to ensure the crimping of said insert ( 2 ) on said wall ( 5 ), wherein said screw ( 3 ) comprises a break ring ( 14 ), which, by being supported on said insert head ( 6 ) directly or indirectly, is designed to immobilize said screw ( 3 ) relative to said insert head ( 6 ), in order to create the deformation of the recess ( 8 ) by rotation of the screw and obtain said crimping, and, once the crimping has been carried out, it is designed to give rise to breakage, such as to release the screw ( 3 ) from said insert head ( 6 ), thus permitting the tightening of an accessory ( 4 ) on the wall ( 5 ),
 wherein the break ring ( 14 ) is supported indirectly against the insert head ( 6 ) by means of bracing means ( 22 ), and 
 wherein the bracing means ( 22 ) comprise a washer ( 16 ) which is provided between said break ring ( 14 ) and the insert head ( 6 ). 
 
     
     
       2. Bolt ( 1 ) as claimed in  claim 1 , wherein said breakage takes place in the break ring ( 14 ). 
     
     
       3. Bolt ( 1 ) as claimed in  claim 1 , wherein said breakage takes place in the bracing means ( 22 ). 
     
     
       4. Bolt ( 1 ) as claimed in  claim 1 , wherein the insert ( 2 ) comprises a means for blocking said insert ( 2 ) in rotation, preferably by an external form with a non-circular transverse cross-section. 
     
     
       5. Bolt ( 1 ) as claimed in  claim 1 , wherein said screw ( 3 ) comprises a screw head ( 10 ) comprising a base ( 11 ) which is designed to be supported on the accessory ( 4 ), a cavity ( 12 ) preferably being provided below said base ( 11 ) in order to accommodate in it at least partially said break ring ( 14 ) and/or said bracing means ( 22 ). 
     
     
       6. Bolt ( 1 ) as claimed in  claim 1 , wherein said insert head ( 6 ), said break ring ( 14 ) and, if applicable, said bracing means ( 22 ) are configured such that, in the assembled position, the screw head ( 10 ) is supported on the insert ( 2 ) by means of the break ring ( 14 ) and/or bracing means ( 22 ), without being supported on said accessory ( 4 ), such as to constitute an attachment which allows said accessory ( 4 ) to be mobile in rotation and/or translation relative to the wall ( 5 ). 
     
     
       7. Bolt ( 1 ) as claimed in  claim 1 , wherein said screw ( 3 ) comprises a non-threaded part, contained between the screw head ( 10 ) and the threaded part ( 13 ), which does not cooperate with the tapped part ( 9 ) of the insert ( 2 ), such as to provide resilience necessary to create the tension of the screw ( 3 ) on said bolt in the tightened situation, even when the thicknesses of the accessories and walls are very slight. 
     
     
       8. Bolt ( 1 ) as claimed in  claim 1 , wherein said insert ( 2 ) has weakening of the recess ( 8 ), such as to facilitate its deformation during the crimping, this weakening preferably taking the form of undercuts. 
     
     
       9. Bolt ( 1 ) as claimed in  claim 1 , wherein said screw ( 3 ) comprises a non-threaded part, contained between a screw head ( 10 ) and a threaded part ( 13 ), which does not cooperate with a tapped part ( 9 ) of the insert ( 2 ), said non-threaded part being provided with a widened part ( 17 ) which is designed to make it possible to fix the broken part of the break ring ( 14 ) by forcing it to slide towards said widened part ( 17 ) during the screwing phase which follows its breakage. 
     
     
       10. Bolt ( 1 ) as claimed in  claim 1 , wherein the insert ( 2 ) contains a lubricant ( 25 ), preferably grease. 
     
     
       11. Bolt ( 1 ) comprising a screw ( 3 ) and an insert ( 2 ) which can be inserted in the opening in a wall ( 5 ), said insert ( 2 ) comprising an insert head ( 6 ) and a shaft ( 7 ) comprising a recess ( 8 ), said insert head ( 6 ) and said recess ( 8 ) being configured such as, after deformation of the recess ( 8 ), to ensure the crimping of said insert ( 2 ) on said wall ( 5 ), wherein said screw ( 3 ) comprises a break ring ( 14 ), which, by being supported on said insert head ( 6 ) directly or indirectly, is designed to immobilize said screw ( 3 ) relative to said insert head ( 6 ), in order to create the deformation of the recess ( 8 ) by rotation of the screw and obtain said crimping, and, once the crimping has been carried out, it is designed to give rise to breakage, such as to release the screw ( 3 ) from said insert head ( 6 ), thus permitting the tightening of an accessory ( 4 ) on the wall ( 5 ),
 wherein the break ring ( 14 ) is supported indirectly against the insert head ( 6 ) by means of bracing means ( 22 ), and 
 wherein the bracing means ( 22 ) comprise a tubular element ( 23 ) provided with a radial spreaded part ( 24 ) which can be supported against the insert head ( 6 ). 
 
     
     
       12. Bolt ( 1 ) as claimed in  claim 11 , wherein said breakage takes place in the bracing means ( 22 ). 
     
     
       13. Bolt ( 1 ) as claimed in  claim 11 , wherein the insert ( 2 ) comprises a means for blocking said insert ( 2 ) in rotation, preferably by an external form with a non-circular transverse cross-section. 
     
     
       14. Bolt ( 1 ) as claimed in  claim 11 , wherein said screw ( 3 ) comprises a screw head ( 10 ) comprising a base ( 11 ) which is designed to be supported on the accessory ( 4 ), a cavity ( 12 ) preferably being provided below said base ( 11 ) in order to accommodate in it at least partially said break ring ( 14 ) and/or said bracing means ( 22 ). 
     
     
       15. Bolt ( 1 ) as claimed in  claim 11 , wherein said insert head ( 6 ), said break ring ( 14 ) and, if applicable, said bracing means ( 22 ) are configured such that, in the assembled position, the screw head ( 10 ) is supported on the insert ( 2 ) by means of the break ring ( 14 ) and/or bracing means ( 22 ), without being supported on said accessory ( 4 ), such as to constitute an attachment which allows said accessory ( 4 ) to be mobile in rotation and/or translation relative to the wall ( 5 ). 
     
     
       16. Bolt ( 1 ) as claimed in  claim 11 , wherein said screw ( 3 ) comprises a non-threaded part, contained between the screw head ( 10 ) and the threaded part ( 13 ), which does not cooperate with the tapped part ( 9 ) of the insert ( 2 ), such as to provide resilience necessary to create the tension of the screw ( 3 ) on said bolt in the tightened situation, even when the thicknesses of the accessories and walls are very slight. 
     
     
       17. Bolt ( 1 ) as claimed in  claim 11 , wherein said insert ( 2 ) has weakening of the recess ( 8 ), such as to facilitate its deformation during the crimping, this weakening preferably taking the form of undercuts. 
     
     
       18. Bolt ( 1 ) as claimed in  claim 11 , wherein the insert ( 2 ) contains a lubricant ( 25 ), preferably grease. 
     
     
       19. Bolt ( 1 ) comprising a screw ( 3 ) and an insert ( 2 ) which can be inserted in the opening in a wall ( 5 ), said insert ( 2 ) comprising an insert head ( 6 ) and a shaft ( 7 ) comprising a recess ( 8 ), said insert head ( 6 ) and said recess ( 8 ) being configured such as, after deformation of the recess ( 8 ), to ensure the crimping of said insert ( 2 ) on said wall ( 5 ), wherein said screw ( 3 ) comprises a break ring ( 14 ), which, by being supported on said insert head ( 6 ) directly or indirectly, is designed to immobilize said screw ( 3 ) relative to said insert head ( 6 ), in order to create the deformation of the recess ( 8 ) by rotation of the screw and obtain said crimping, and, once the crimping has been carried out, it is designed to give rise to breakage, such as to release the screw ( 3 ) from said insert head ( 6 ), thus permitting the tightening of an accessory ( 4 ) on the wall ( 5 ),
 wherein the break ring ( 14 ) is supported indirectly against the insert head ( 6 ) by means of bracing means ( 22 ), 
 wherein the bracing means ( 22 ) comprise a tubular element ( 23 ) provided with a radial spreaded part ( 24 ) which can be supported against the insert head ( 6 ), and 
 wherein said break ring ( 14 ) is constituted by the screw head ( 10 ). 
 
     
     
       20. Bolt ( 1 ) comprising a screw ( 3 ) and an insert ( 2 ) which can be inserted in the opening in a wall ( 5 ), said insert ( 2 ) comprising an insert head ( 6 ) and a shaft ( 7 ) comprising a recess ( 8 ), said insert head ( 6 ) and said recess ( 8 ) being configured such as, after deformation of the recess ( 8 ), to ensure the crimping of said insert ( 2 ) on said wall ( 5 ), wherein said screw ( 3 ) comprises a break ring ( 14 ), which, by being supported on said insert head ( 6 ) directly or indirectly, is designed to immobilize said screw ( 3 ) relative to said insert head ( 6 ), in order to create the deformation of the recess ( 8 ) by rotation of the screw and obtain said crimping, and, once the crimping has been carried out, it is designed to give rise to breakage, such as to release the screw ( 3 ) from said insert head ( 6 ), thus permitting the tightening of an accessory ( 4 ) on the wall ( 5 ),
 wherein said breakage takes place in the break ring ( 14 ), 
 wherein the screw ( 3 ) comprises a screw head ( 10 ) and a threaded part ( 13 ), 
 wherein the screw head ( 10 ) comprises a male indentation ( 18 ) having external dimensions which are greater than an external diameter of the threaded part ( 13 ), 
 wherein the screw head ( 10 ), the male indentation ( 18 ), and the threaded part ( 13 ) are formed in one piece, and 
 wherein the break ring ( 14 ) is provided between the screw head ( 10 ) and the threaded part ( 13 ) of the screw ( 3 ), the break ring ( 14 ) being spaced apart from the screw head ( 10 ). 
 
     
     
       21. Bolt ( 1 ) as claimed in  claim 20 , wherein the break ring ( 14 ) is supported directly against the insert head ( 6 ). 
     
     
       22. Bolt ( 1 ) as claimed in  claim 20 , wherein the insert ( 2 ) comprises a means for blocking said insert ( 2 ) in rotation, preferably by an external form with a non-circular transverse cross-section. 
     
     
       23. Bolt ( 1 ) as claimed in  claim 20 , wherein said screw ( 3 ) comprises a screw head ( 10 ) comprising a base ( 11 ) which is designed to be supported on the accessory ( 4 ), a cavity ( 12 ) preferably being provided below said base ( 11 ) in order to accommodate in it at least partially said break ring ( 14 ) and/or said bracing means ( 22 ). 
     
     
       24. Bolt ( 1 ) as claimed in  claim 20 , wherein said insert head ( 6 ), said break ring ( 14 ) and, if applicable, said bracing means ( 22 ) are configured such that, in the assembled position, the screw head ( 10 ) is supported on the insert ( 2 ) by means of the break ring ( 14 ) and/or bracing means ( 22 ), without being supported on said accessory ( 4 ), such as to constitute an attachment which allows said accessory ( 4 ) to be mobile in rotation and/or translation relative to the wall ( 5 ). 
     
     
       25. Bolt ( 1 ) as claimed in  claim 20 , wherein said screw ( 3 ) comprises a non-threaded part, contained between the screw head ( 10 ) and the threaded part ( 13 ), which does not cooperate with the tapped part ( 9 ) of the insert ( 2 ), such as to provide resilience necessary to create the tension of the screw ( 3 ) on said bolt in the tightened situation, even when the thicknesses of the accessories and walls are very slight. 
     
     
       26. Bolt ( 1 ) as claimed in  claim 20 , wherein said insert ( 2 ) has weakening of the recess ( 8 ), such as to facilitate its deformation during the crimping, this weakening preferably taking the form of undercuts. 
     
     
       27. Bolt ( 1 ) as claimed in  claim 20 , wherein said screw ( 3 ) comprises a non-threaded part, contained between the screw head ( 10 ) and the threaded part ( 13 ), which does not cooperate with the tapped part ( 9 ) of the insert ( 2 ), said non-threaded part being provided with a widened part ( 17 ) which is designed to make it possible to fix the broken part of the break ring ( 14 ) by forcing it to slide towards said widened part ( 17 ) during the screwing phase which follows its breakage. 
     
     
       28. Bolt ( 1 ) as claimed in  claim 20 , wherein the insert ( 2 ) contains a lubricant ( 25 ), preferably grease. 
     
     
       29. Method for securing an accessory ( 4 ) on a wall ( 5 ) by means of a bolt ( 1 ), the bolt comprising a screw ( 3 ) and an insert ( 2 ) which can be inserted in the opening in a wall ( 5 ), said insert ( 2 ) comprising an insert head ( 6 ) and a shaft ( 7 ) comprising a recess ( 8 ), said insert head ( 6 ) and said recess ( 8 ) being configured such as, after deformation of the recess ( 8 ), to ensure the crimping of said insert ( 2 ) on said wall ( 5 ), wherein said screw ( 3 ) comprises a break ring ( 14 ), which, by being supported on said insert head ( 6 ) directly or indirectly, is designed to immobilize said screw ( 3 ) relative to said insert head ( 6 ), in order to create the deformation of the recess ( 8 ) by rotation of the screw and obtain said crimping, and, once the crimping has been carried out, it is designed to give rise to breakage, such as to release the screw ( 3 ) from said insert head ( 6 ), thus permitting the tightening of an accessory ( 4 ) on the wall ( 5 ),
 wherein said accessory ( 4 ) comprises an accessory opening ( 20 ) designed to allow the insert head ( 6 ) to pass through, and said wall ( 5 ) comprises a wall opening ( 19 ) designed to allow the shaft ( 7 ) of the insert ( 2 ) to pass through, 
 the method comprising the steps of:
 a) arranging the accessory ( 4 ) on the wall ( 5 ), such as to align the accessory ( 20 ) and wall ( 19 ) openings, 
 b) introducing the bolt ( 1 ) into the openings thus aligned, in the direction from the accessory ( 4 ) towards the wall ( 5 ), until the insert head ( 6 ) is applied on the wall ( 5 ), 
 c) rotating the screw ( 3 ), with a thread ( 13 ) of the screw ( 3 ) cooperating with a tapping ( 9 ) of the insert ( 2 ), the break ring ( 14 ) being supported on the insert head ( 6 ), if applicable by means of bracing means ( 22 ), thus creating deformation of the recess ( 8 ) below the wall ( 5 ), and consequently carrying out the crimping of the insert ( 2 ) on the wall ( 5 ), 
 d) increasing the torque until breakage is obtained, thus releasing the screw ( 3 ) from the insert head ( 6 ), and 
 e) continuing rotation of the screw ( 3 ) until the accessory ( 4 ) is tightened on the wall ( 5 ).